These coins gain value over time because they are ... Here’s a look at 10 modern silver dollar commemorative coins worth $100 or more on the buyer’s market, in chronological order (all prices ...

Zimbabwe's central bank allowed its citizens to exchange the country's almost worthless currency for US dollars. Its 100-trillion-dollar note is worth just 40 U.S. cents.

The key here is “denominations.” Other coinage provisions are specific on value—dimes, quarter dollars, dollars, etc. But the platinum bullion coin provision doesn’t specify any amounts.